Reboring device



Feb. 15,1927. 1,618,037

c. w. WRIGHT REBORING DEVICE Filed Sept. 23. 1924 2 She'ets-Sheet 1 INVENTOR ATTORNEY WIITNESS:

Patented Feb. 15, 1927.

.UNITED STATES CHARLES W. WRIGHT, 0]"

BLOOMINGTON, ILLINOIS.

nnnonme DEVICE.

Application filed. September 23, 1924. Serial No. 739,393.

The object of my said invention is the provision of a practically advantageous device designed more especially for reboring the cylinders of automobile engines of the internal combustion type.

To the attainment of the foreging, the invention consists in the improvement as hereinafter described and definitely claimed.

In the accompanying drawings, forming part of this specification v Figure 1 is a side elevation showing the preferred embodiment of my invention equipped to be actuated by a motor.

Figures 2, 3 and 4 are cross-sections taken in the planes indicated by the lines 22, 33 and t-4,-respectively. of Figure 1.

Figure 5 is a diametrical section of the device taken on the line 55 of Figure 4.

Figure 6 is a diametrical section taken on the line 66 of Figure 4.

Figure 7 is a detail plan view partly in section of the nut for positioning the knife blades of the device relative to the cente? thereof and when blades of different sizes are to be used. a

Figure 8 is a detail view of one of the interior nuts of the device.

Figure 9 is a detail view of one of the knife blades.

Similar numerals of reference designate corresponding parts in all of the views of the drawings.

Among other elements my novel device comprises a head 1 havig a central aperture 2 and also having threaded bores 3 extending to its sides.

When my novel device is to be driven or turned about its axis by a motor, a yoke 4 such as shown in Figures 1 and 2 is connected by bolts 5 through thehead 1, the said yoke having a shank 6 for connection to a motor or for connection to a drill or the like driven by a motor. W'hen, however, my novel device is to be operated by hand the yoke 4 is removed as are also the bolts 5 and handles 7 such as shown in Figure 7 are threadedly fixed in the head 1.

The head 1 is superimposed on and connected by screws 8 or other appropriate means to the upper end of a body 9, and it will also be noted by a reference to Figure 5 that I prefer to employ pins 10 for correctly positioning the head 1 on the body 9. A, shaft 11 extends through the head 1 and body 9 and is enlarged at 12 and is providedwith. a thread 13.

The upper portion of the body 9 is reduced and exteriorly threaded as designated by 14, and the said body 9 is exteriorlylower portion 'with a comparatively large bore 21 in which are disposed aslide member 22, and a nut 23 in engagement with 'the thread 13. A coiled spring 24 surrounds the shaft 11 and is interposed between and' bears against the opposed ends of the member 22 and nut 23. This spring 24, I term a kick back spring inasmuch as it serves to push the slide member 22 back to release the top set of lugs hereinafter described when the device is being removed from a cylinder. An expansion spring 24* is partially housed in the slide member 22 and is interposed between said slide member and an abutment 1O on the shaft 11. This expansion spring assures even pressure on the lugs hereinafter described and maintains an accurate center at all times. The said nut 23 is held against turning in the body 9 by a pin 25 on the nut disposed in a longitudinal guideway 26 in the body 9. It will also be noticed that the member 22 and nut 23 are provided with. taper portions 27. These taper portions bear against the beveled inner ends of lugs 28, Figure 6,

guided in the body 9 and yieldingly pressed inward or toward the axis-of the body 9 by springs 29, Figures 1 and 6. The said lugs 28 by engaging the wall of a cylinder bore serve to regulate the depth of the cut, and.

also have it understood that the blades 30 may be of different sizes, my improvement providing for the ready removal of one set .of blades and the incorporation of another set of'blades. This will be better "understood when it is stated that the blades are pro vided at opposite ends with hooks 31 and that the blades are maintained'in working position by upper and lower sprin rings 32 which encompass the upper and hold the same against outward radial movement.

The body 9 is provided at its outer side with tapers 33, and the blades 30 are provided with 'the'inclined inner edges-34 and 35 to engage said tapers; and it will also be noticed that, the blades are shoulderedat 36 t0 bring up against the shoulder 37 v of the body 9 so'as to limit upward movement of the blades as shown in Figure 5. It will also be noticed by reference to Figure 5 that the blades 30 are notched at 38 to receive the flange 18 of the nut 16 and that the blades extend above and below the stop plate 19 which is adapted to rest on the upper end of a cylinder that is to be rebored and support the reboring device while at work.

Manifestly by applying 1 appropriate means to the upper end of the shaft 11 the said shaft 11 may be conveniently turned about its axis for the convenient adjust ment of the device. It will be apparent from the foregoing that by adjusting the nut 16 the blades30 may be made to extend to a greater or less extent radially from the body, andby turning the shaft 11 the lugs 28 may be: thrust to a ho y, the springs 29 serving at all itimes to yieldingly hold the lugs 28 in engagement with the member 22 and nut 23. I

I have specifically described-the construc-v tion and relative arrangement of the parts comprised .in the preferred embodiment {of my invention in order to impart-an; exact understanding of said embodimenti' I. do

not desire, however. to be understood as confining myself to the specific construction and relative arrangement of parts as disclosed inasmuch as my invention is defined by my appended claims within the scope of which changes may be made without affecttion.

lower; ends of the blades and serve to yieldingly having a bore, means connected to said body foil the turning of the same about its axis,

reater or less extent laterally from the ing or involving departure from my inven- -Having described my invention, what I claim and desire to secure by Letters Patent, is

1.3A reboring device comprising a body a threaded shaft extending through the body, a nut disposed and held against turning in the body and engaged by the body? and having a tapered portion, a slide for the turning of the same about its axis,

a' threaded shaft extending through and adapted to abut against said body, a nut disposed and held against turning in the iibody and engaged by the thread of said shaft and having a tapered portion, a slide member on the shaft and having atapered port-ion, a spring between the nut and said slide memher, an expansion spring between said slide member and an abutment on the shaft, lugs guided in the body and disposed against the tapered portions of the nut and slide member whereby movement of the nut and slide member on the shaft will adjust said lugs transversely of the body, cutting blades supported upon the body, the said body having ;a shoulder at the intermediate portion of its Ien'gthand being combined with a stopplate superimposed on and connected to the. same and adapted to rest on a cylinder for supporting the device in the bore of the cylinder.

In testimony whereof I aflix m si nature.

CHARLES w. RIarHT. 

